border-radius

1rem radii for all four corners

1rem radii for top-left and bottom-right corners, 2rem radii for top-right and bottom-left corners

1rem and 0.5rem radii for top-left and bottom-right corners, 2rem and 0.5rem radii for top-right and bttom left corners

1rem and 0.5rem radii for top-left corner, 2rem and 1.5rem radii for top-right and bottom-left corners, 3rem and 0.5rem radii for bottom-right corner;

1rem and 0.5rem radii for top-left corner, 2rem and 1.5rem radii for top-right corner, 3rem and 2.5rem radii for bottom-right corner, 4rem and 3.5rem radii for bottom-left corner;